MySpace has a bit more users, at about 85 to 75 million judging from the graphs. But Myspace traffic is about 92% from North America, and almost all of the remainder from Europe. YouTube is much more evenly split, with its largest usage from Asia about 38%, then Europe 32%, then North America 28% and the rest of the world splits the rest

The fact that YouTube is so evenly split globally is testament to their ubiquitous appeal - i.e. pretty much everyone thinks it's great.